George,

I especially like the summation:

Why do we worry so much about the supposed concentration of economic
power in the hands of “the rich,” a group of strangers who don’t
coordinate their actions in any way, but care so little about the
vastly greater concentration of economic power in the hands of Congress? 

In a slightly different context, one also could ask why we worry about supposed failures of the free market but care so little about the detrimental meddling of ill-informed politicians in other spheres of our lives.